Influence of rheological properties of cement mortar on steel fiber distribution in UHPC

2017 ◽  
Vol 144 ◽  
pp. 65-73 ◽  
Author(s):  
Rui Wang ◽  
Xiaojian Gao ◽  
Huanghuang Huang ◽  
Guangshuai Han
Keyword(s):  
Rheological Properties ◽  
Steel Fiber ◽  
Cement Mortar ◽  
Fiber Distribution

Experimental Research on Reinforcing Effect of Spiral Steel Fiber

2012 ◽  
Vol 174-177 ◽  
pp. 668-671
Author(s):  
He Ting Zhou
Keyword(s):  
Reinforced Concrete ◽  
Bond Strength ◽  
Experimental Research ◽  
Significant Role ◽  
Steel Fiber ◽  
Cement Mortar ◽  
Fiber Reinforced Concrete ◽  
Steel Fibers ◽  
Steel Fiber Reinforced Concrete ◽  
Reinforcing Effect

Steel fiber has a fine nature in reinforcing concrete. This essay aims to find out the influence of physical forms of steel fiber on its nature of reinforcement. By comparing two types of cement mortar reinforced by steel fibers, it is found that spiral steel fibers have a better bond strength with matrix than straight ones. Therefore, a conclusion could be drawn that physical forms of the steel fiber play a significant role in steel fiber reinforced concrete, and the experiment also serves a rewarding reference to the application of spiral steel fibers.

Resistance to Underwater Abrasion of Fiber Reinforced Cement Mortar

2017 ◽  
Vol 728 ◽  
pp. 379-383 ◽  
Author(s):  
Warun Wongprachum ◽  
Manote Sappakittipakorn ◽  
Pijit Jiemvarangkul
Keyword(s):  
Weight Loss ◽  
Abrasion Resistance ◽  
Steel Fiber ◽  
Cement Mortar ◽  
Polypropylene Fiber ◽  
Fiber Reinforced ◽  
Hydraulic Concrete ◽  
Reinforced Cement

Surfaces of hydraulic concrete conduits where significant abrasion of waterborne sediment can occur often degrade and need a regular repair to maintain their serviceability. In this research, thin overlay made of fiber reinforced cement mortar was introduced as a repair measures. Its resistance to underwater abrasion was therefore experimentally evaluated following the procedures of ASTM C 1138. This research utilized three types of fiber: steel fiber, polypropylene fiber, and micro polypropylene fiber (the micro polypropylene fiber was used only in a combination with either the steel or the polypropylene fiber). The influence of these fibers on the abrasion resistance of fiber reinforced cement mortar was then determined in terms of weight loss. The weight loss results showed that the fibers added to mortar specimens can enhance the abrasion resistance. Between the steel and polypropylene fiber, the latter provided better abrasion resistance. In case of the combination mixes, the micro polypropylene fiber increased abrasion resistance when combined with the polypropylene fiber but had no benefit when combined with the steel fiber.

A simple microwave method to assess the uniformity of steel fiber distribution in the SFRC

2020 ◽  
Vol 35 (1) ◽  
pp. 83-94
Author(s):  
Zi-Kai Yang ◽  
Zhao Li ◽  
Sheng Zhao ◽  
Xiang-Dong Huang
Keyword(s):  
Steel Fiber ◽  
Microwave Method ◽  
Fiber Distribution

Abrasion of Reactive Powder Concrete under Direct Water Impact

2020 ◽  
Vol 897 ◽  
pp. 41-48 ◽  
Author(s):  
Munther L. Abdul Hussein ◽  
Sallal R. Abid ◽  
Sajjad H. Ali
Keyword(s):  
Steel Fiber ◽  
Fiber Type ◽  
Polypropylene Fiber ◽  
Experimental Program ◽  
Reactive Powder Concrete ◽  
Fiber Distribution ◽  
Hybrid Fiber ◽  
Normal Concrete ◽  
Weight Losses ◽  
Reactive Powder

An experimental program was directed in this study to evaluate the abrasion resistance of reactive powder concrete (RPC) under direct normal impact of water jet. Abrasion and compressive strength specimens were cast from six RPC mixtures using different single and hybrid distributions of 6 mm-length and 15 mm-length micros-steel fibers and 18 mm-length polypropylene fiber. Fixed mix proportions were used for the six RPC mixtures and with fixed total volumetric fiber content of 2.5%. In addition to the RPC mixtures, a normal concrete mixture was prepared for comparison purposes. All specimens were cured in the same conditions and tested at an age of 28 days. The test results showed that abrasion weight losses increase with time at rates that are independent of fiber type and fiber distribution. The results also showed that all RPC mixtures exhibited significantly lower abrasion losses than normal concrete. The lowest percentage abrasion weight losses were recorded for the mixture with pure 15 mm micro-steel, where after 12 testing hours, it was 0.41% of the total weight before testing. On the other hand, the mixture with pure 6 mm micro-steel fiber exhibited the highest percentage abrasion weight loss (0.98%) among the six RPC mixtures. Another conclusion is that the inclusion of polypropylene fiber to compose hybrid fiber distribution with micro-steel fiber led mostly to lower abrasion losses.

scholarly journals Predicting Pumpability and Shootability of Crushed Aggregate Wet-Mix Shotcrete Based on Rheological Properties

2016 ◽  
Vol 2016 ◽  
pp. 1-9 ◽  
Author(s):  
Kyong-Ku Yun ◽  
Pangil Choi ◽  
Jung Heum Yeon
Keyword(s):  
Fly Ash ◽  
Rheological Properties ◽  
Silica Fume ◽  
Steel Fiber ◽  
Wide Spectrum ◽  
Granulated Blast Furnace Slag ◽  
Compliance Testing ◽  
Testing Data ◽  
Crushed Aggregate ◽  
Pump Pressure

This study aims to estimate the pumpability and shootability of wet-mix shotcrete (WMS) made with crushed aggregates and various admixtures such as silica fume, fly ash, ground granulated blast furnace slag (GGBFS), metakaolin, and steel fiber based on rheological properties. The IBB rheometer was employed as an apparatus to measure the rheological properties of freshly mixed shotcrete such as flow resistance and torque viscosity. Results have shown that the use of silica fume and metakaolin led to satisfactory pumpability, whereas mixtures with fly ash and steel fiber failed to meet the pumping criteria at normal pump pressure. The build-up thickness, an indicator to represent shotcrete shootability, was predicted to vary between 68 and 218 mm, demonstrating that the use of admixtures resulted in a wide spectrum of shootability. In particular, the use of metakaolin was found to substantially increase the predicted build-up thickness only with a small replacement. The findings of this study are expected to be used as an easy-to-use guideline for estimating pumpability and shootability of WMS when no compliance testing data is available.

Orthogonal Experimental Study on Properties of Hybrid Fiber Reinforced Cement Mortar

2010 ◽  
Vol 168-170 ◽  
pp. 456-459
Author(s):  
Hai Yan Yuan ◽  
Shui Zhang ◽  
Guo Zhong Li
Keyword(s):  
Compressive Strength ◽  
Flexural Strength ◽  
Steel Fiber ◽  
Cement Mortar ◽  
Polypropylene Fiber ◽  
Fiber Reinforced ◽  
Hybrid Fiber ◽  
Factors Affecting ◽  
Fiber Fraction ◽  
Reinforced Cement

By adopting the method of orthogonal experimental design, the effect of three independent variables, that is steel fiber fraction, polypropylene fiber fraction and silica fume fraction on the compressive strength, flexural strength and shrinkage of cement mortar was studied. The results indicate that steel fiber is one of the most important factors affecting compressive strength and shrinkage, and polypropylene fiber is one of the most important factors affecting flexural strength and shrinkage of cement mortar. By using deviation analysis to analyze the orthogonal experiment results, the optimized mix proportion of hybrid fiber reinforced cement mortar is determined. The hybrid effect of steel fiber and polypropylene fiber on the properties of cement mortar is discussed.

scholarly journals Tensile strength of 3D textiles reinforced cementitious composites plates

2018 ◽  
Vol 162 ◽  
pp. 04008
Author(s):  
Ikbal Gorgis ◽  
Waleed Abbas ◽  
Nadia Moneen
Keyword(s):  
Tensile Strength ◽  
Compressive Strength ◽  
Strain Hardening ◽  
Steel Fiber ◽  
Volume Fraction ◽  
Cement Mortar ◽  
Glass Fabric ◽  
Cementitious Composites ◽  
3D Textiles

Tensile plate specimens with dimension of 450×100×40mm were cast with 3D glass fabric having three different thicknesses 6, 10 and 15mm to measure their tensile strength. Plates with one and two layers of chicken wires, as well as micro steel fiber of 0.75% volume fraction were tested under tensile for comparison with references plates. Cement mortar with 61.2MPa cube compressive strength at 28 days was designed for casing the plates. The results indicated that after cracking of the mortar the textile reinforcement adds a strain hardening trajectory, that cause failure to occurs at slightly higher load and a higher strain. The improvement in tensile strength at 28 days ranged between 5 to 30%, and for 90 days between 5 to 60% for the three types of fibres used. Based on the results a significant increase was indicated with micro steel fiber.

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